3918691 has 4 divisors (see below), whose sum is σ = 4478512. Its totient is φ = 3358872.

The previous prime is 3918689. The next prime is 3918697. The reversal of 3918691 is 1968193.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3918691 - 2¹ = 3918689 is a prime.

It is a super-2 number, since 2×3918691² = 30712278306962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3918691.

It is not an unprimeable number, because it can be changed into a prime (3918697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279900 + ... + 279913.

It is an arithmetic number, because the mean of its divisors is an integer number (1119628).

Almost surely, 2^3918691 is an apocalyptic number.

3918691 is a deficient number, since it is larger than the sum of its proper divisors (559821).

3918691 is an equidigital number, since it uses as much as digits as its factorization.

3918691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559820.

The product of its digits is 11664, while the sum is 37.

The square root of 3918691 is about 1979.5683873006. The cubic root of 3918691 is about 157.6571506120.

The spelling of 3918691 in words is "three million, nine hundred eighteen thousand, six hundred ninety-one".